Unit Test Review GA-GSE Biology A-CR 17-18 – Flashcards
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Which flow chart correctly organizes the structures of heredity, from least to most complex?
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A.codon ® gene ® DNA ® chromosome
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Which accurately describes the relationship between cancer risk and exposure to mutagens?
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B.Cancer risk increases when a person is exposed to mutagens because the risk of DNA mutations increases as well.
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A strand of DNA contains the bases adenine, cytosine, cytosine, and guanine, in that order. Which would be the order of the bases on the complementary strand of DNA?
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C.thymine, guanine, guanine, and cytosine
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Which agent would cause the least damage to a chromosome?
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D.ultrasound
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Photo 51 is a picture of the structure of DNA that was used to create a model of DNA. Who created the photo?
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C.Rosalind Franklin
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The DNA sequence TTG is changed to TCG and produces a new protein. Which type of mutation is this?
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A.missense
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Many different types of mutations can occur within the body. An individual experiences a mutation that changes a base in a tRNA strand, but during translation the tRNA strand still creates the same protein. Which type of mutation is responsible for the change in the tRNA base?
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A.silent
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Fragile X syndrome, characterized by mental retardation, is caused by which chromosomal change?
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D.insertion
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Which best describes a codon?
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C.the sequence of three bases that codes for a specific amino acid
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Which does not occur during translation?
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C.DNA is transcribed into a complementary strand of mRNA.
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Consider the mRNA wheel. mc022-1.jpg Which amino acid is coded for by the mRNA codon UAA?
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B.stop codon
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Which is an agent that causes a mutation in DNA or chromosomes?
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C.mutagen
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Which base is found only in DNA?
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D.thymine
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A DNA strand has the sequence ATCGGC. Which is the complementary strand of DNA?
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C.TAGCCG
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What must first occur for transcription to begin?
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C.RNA polymerase attaches to the promoter.
